i just installed a mopar performance pcm, and wanted to test the new performance. so i did a couple fairly hard launches (4000 or less with fairly easy clutch let off, not a 4000 clutch DROP). no problems...

today, i was driving it, and did just a small one (about 2000 launch or so, again, not dropping the clutch, just a nice quick let out), and it started vibrating more noticeably

my neon has always vibrated, as i have the motor mount inserts, and the mopar performance bobble strut. but this is something different than i've noticed before.

it's really bad around 2500-3000 rpm, and i feel it through the steering wheel, the dash, and pretty much everywhere.

any ideas? i'm kind of thinking front motor mount...

 

Snapped the front motor mount..I've snapped 3 of em.

 

how obvious would the break be? i looked at it as best i could from the front and it didn't look broken... also, where would it be most likely to break at?

 

right under the starter where it bolts flat against the side of the motor.

 

so i just started getting a code 25 (idle air control circuit, idle on within plus or minus 200, something else) which explains my engine not running well while cold, but as this is a new occurance, would this have anything to do with my vibration? i doubt it, but just asking...

also, it seems like my steering wheel isn't aligned well anymore, it's close, but it's just off center, and seems to move a bit.

all of my vibration stuff started after a hard launch, as i said in my first post. i also made a REALLY hard left turn just after that. would that have been enough to shift something enough to vibrate?